You can find documentation on rulesets on the online Help:
http://microsite.omniture.com/t2/help/en_US/s7/is_ir_api/index.html#is_api-image_catalog-Rule_Set_Reference
There are a few sample rulesets that can help you with creating rulesets. Be careful before using rulesets, since they can prevent Scene7 content from being displayed on your site.
